// webpack打包配置文件
'use strict'

// 导入path包
const path = require('path')
// 导入项目的配置文件
const defaultSettings = require('./src/settings.js')

// 将相对路径改为绝对路径
function resolve(dir) {
  return path.join(__dirname, dir)
}

// 设置网页的标题名
const name = defaultSettings.title || 'vue Admin Template' // page title

// 设置端口号
const port = process.env.port || process.env.npm_config_port || 9528 // dev port

let externals = {}
let cdn = { css: [], js: [] }
const isProduction = process.env.NODE_ENV === 'production' // 判断是否是生产环境
if (isProduction) {
  externals = {
    /**
      * externals 对象属性解析：
      * '包名' : '在项目中引入的名字'
    */
    'vue': 'Vue',
    'element-ui': 'ELEMENT',
    'xlsx': 'XLSX'
  }
  cdn = {
    css: [
      'https://unpkg.com/element-ui/lib/theme-chalk/index.css' // element-ui css 样式表
    ],
    js: [
      // vue must at first!
      'https://unpkg.com/vue@2.6.12/dist/vue.js', // vuejs
      'https://unpkg.com/element-ui/lib/index.js', // element-ui js
      'https://cdn.bootcdn.net/ajax/libs/xlsx/0.16.0/xlsx.min.js' // xlsx
    ]
  }
}

module.exports = {
  // 配置打包产出的目录以什么方式 : '/' ===>服务器的环境下运行 '/'可以使用相对路径的方式访问
  publicPath: process.env.NODE_ENV === 'development' ? '/' : './',
  // 设置导出的目录
  outputDir: 'dist',
  // 设置静态文件目录
  assetsDir: 'static',
  // 是否开启eslint检查
  lintOnSave: process.env.NODE_ENV === 'development',
  // 是否开启Map
  productionSourceMap: false,
  // Server服务器相关设置
  devServer: {
    port: port, // 设置端口号
    open: true, // 是否自动在游览器打开
    // 错误提示是否在游览器显示
    overlay: {
      warnings: false,
      errors: true
    },
    // 代理配置
    proxy: {
      // 如果请求地址以/api打头,就出触发代理机制
      '/api': {
        // target: 'http://ihrm.itheima.net' // 我们要代理的真实接口地址
        // target: 'http://192.168.100.99:3000' // 老师本地服务器
        target: 'http://192.168.100.84:3000'
      }
    }
  },
  // Webpack相关配置  [对象配置]
  configureWebpack: {
    name: name,
    // 添加排除项
    externals: externals,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },

  // Webpack相关的配置 [函数配置]
  chainWebpack(config) {
    // 打包优化-去掉console-log
    config.optimization.minimizer('terser').tap((args) => {
      args[0].terserOptions.compress.drop_console = true
      return args
    })
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    config.plugins.delete('prefetch')

    config.module.rule('svg').exclude.add(resolve('src/icons')).end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config.when(process.env.NODE_ENV !== 'development', (config) => {
      config
        .plugin('ScriptExtHtmlWebpackPlugin')
        .after('html')
        .use('script-ext-html-webpack-plugin', [
          {
            inline: /runtime\..*\.js$/
          }
        ])
        .end()
      config.optimization.splitChunks({
        chunks: 'all',
        cacheGroups: {
          libs: {
            name: 'chunk-libs',
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: 'initial' // only package third parties that are initially dependent
          },
          elementUI: {
            name: 'chunk-elementUI', // split elementUI into a single package
            priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
          },
          commons: {
            name: 'chunk-commons',
            test: resolve('src/components'), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true
          }
        }
      })
      config.optimization.runtimeChunk('single')
    })
    // 注入cdn变量 (打包时会执行)
    config.plugin('html').tap(args => {
      args[0].cdn = cdn // 配置cdn给插件
      return args
    })
  }
}

